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  <section id="program-listing-for-file-ptq-h">
<span id="program-listing-file-cpp-include-torch-tensorrt-ptq-h"></span><h1>Program Listing for File ptq.h<a class="headerlink" href="#program-listing-for-file-ptq-h" title="Permalink to this headline">¶</a></h1>
<p>↰ <a class="reference internal" href="file_cpp_include_torch_tensorrt_ptq.h.html#file-cpp-include-torch-tensorrt-ptq-h"><span class="std std-ref">Return to documentation for file</span></a> (<code class="docutils literal notranslate"><span class="pre">cpp/include/torch_tensorrt/ptq.h</span></code>)</p>
<div class="highlight-cpp notranslate"><div class="highlight"><pre><span></span><span class="cm">/*</span>
<span class="cm"> * Copyright (c) NVIDIA Corporation.</span>
<span class="cm"> * All rights reserved.</span>
<span class="cm"> *</span>
<span class="cm"> * This library is licensed under the BSD-style license found in the</span>
<span class="cm"> * LICENSE file in the root directory of this source tree.</span>
<span class="cm"> */</span>
<span class="cp">#pragma once</span>

<span class="cp">#include</span><span class="w"> </span><span class="cpf">&lt;fstream&gt;</span>
<span class="cp">#include</span><span class="w"> </span><span class="cpf">&lt;iostream&gt;</span>
<span class="cp">#include</span><span class="w"> </span><span class="cpf">&lt;iterator&gt;</span>
<span class="cp">#include</span><span class="w"> </span><span class="cpf">&lt;memory&gt;</span>
<span class="cp">#include</span><span class="w"> </span><span class="cpf">&lt;sstream&gt;</span>
<span class="cp">#include</span><span class="w"> </span><span class="cpf">&lt;string&gt;</span>
<span class="cp">#include</span><span class="w"> </span><span class="cpf">&lt;vector&gt;</span>

<span class="cp">#include</span><span class="w"> </span><span class="cpf">&quot;NvInfer.h&quot;</span>
<span class="cp">#include</span><span class="w"> </span><span class="cpf">&quot;torch/torch.h&quot;</span>
<span class="cp">#include</span><span class="w"> </span><span class="cpf">&quot;torch_tensorrt/logging.h&quot;</span>
<span class="cp">#include</span><span class="w"> </span><span class="cpf">&quot;torch_tensorrt/macros.h&quot;</span>

<span class="cp">#ifndef DOXYGEN_SHOULD_SKIP_THIS</span>
<span class="k">namespace</span><span class="w"> </span><span class="nn">nvinfer1</span><span class="w"> </span><span class="p">{</span>
<span class="k">class</span><span class="w"> </span><span class="nc">IInt8Calibrator</span><span class="p">;</span>
<span class="k">class</span><span class="w"> </span><span class="nc">IInt8EntropyCalibrator2</span><span class="p">;</span>
<span class="p">}</span><span class="w"> </span><span class="c1">// namespace nvinfer1</span>

<span class="k">namespace</span><span class="w"> </span><span class="nn">torch_tensorrt</span><span class="w"> </span><span class="p">{</span>
<span class="k">namespace</span><span class="w"> </span><span class="nn">ptq</span><span class="w"> </span><span class="p">{</span>
<span class="n">TORCHTRT_API</span><span class="w"> </span><span class="kt">bool</span><span class="w"> </span><span class="n">get_batch_impl</span><span class="p">(</span><span class="kt">void</span><span class="o">*</span><span class="w"> </span><span class="n">bindings</span><span class="p">[],</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="kt">char</span><span class="o">*</span><span class="w"> </span><span class="n">names</span><span class="p">[],</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">nbBindings</span><span class="p">,</span><span class="w"> </span><span class="n">torch</span><span class="o">::</span><span class="n">Tensor</span><span class="o">&amp;</span><span class="w"> </span><span class="n">data</span><span class="p">);</span>
<span class="p">}</span>
<span class="p">}</span><span class="w"> </span><span class="c1">// namespace torch_tensorrt</span>
<span class="cp">#endif </span><span class="c1">// DOXYGEN_SHOULD_SKIP_THIS</span>

<span class="k">namespace</span><span class="w"> </span><span class="nn">torch_tensorrt</span><span class="w"> </span><span class="p">{</span>
<span class="k">namespace</span><span class="w"> </span><span class="nn">ptq</span><span class="w"> </span><span class="p">{</span>

<span class="k">template</span><span class="w"> </span><span class="o">&lt;</span><span class="k">typename</span><span class="w"> </span><span class="nc">Algorithm</span><span class="p">,</span><span class="w"> </span><span class="k">typename</span><span class="w"> </span><span class="nc">DataLoaderUniquePtr</span><span class="o">&gt;</span>
<span class="k">class</span><span class="w"> </span><span class="nc">Int8Calibrator</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="n">Algorithm</span><span class="w"> </span><span class="p">{</span>
<span class="w">  </span><span class="k">using</span><span class="w"> </span><span class="n">DataLoader</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">typename</span><span class="w"> </span><span class="nc">DataLoaderUniquePtr</span><span class="o">::</span><span class="n">element_type</span><span class="p">;</span>
<span class="w">  </span><span class="k">using</span><span class="w"> </span><span class="n">Batch</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">typename</span><span class="w"> </span><span class="nc">DataLoader</span><span class="o">::</span><span class="n">super</span><span class="o">::</span><span class="n">BatchType</span><span class="p">;</span>

<span class="w"> </span><span class="k">public</span><span class="o">:</span>
<span class="w">  </span><span class="n">Int8Calibrator</span><span class="p">(</span><span class="n">DataLoaderUniquePtr</span><span class="w"> </span><span class="n">dataloader</span><span class="p">,</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">string</span><span class="o">&amp;</span><span class="w"> </span><span class="n">cache_file_path</span><span class="p">,</span><span class="w"> </span><span class="kt">bool</span><span class="w"> </span><span class="n">use_cache</span><span class="p">)</span>
<span class="w">      </span><span class="o">:</span><span class="w"> </span><span class="n">dataloader_</span><span class="p">(</span><span class="n">dataloader</span><span class="p">.</span><span class="n">get</span><span class="p">()),</span><span class="w"> </span><span class="n">cache_file_path_</span><span class="p">(</span><span class="n">cache_file_path</span><span class="p">),</span><span class="w"> </span><span class="n">use_cache_</span><span class="p">(</span><span class="n">use_cache</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w">    </span><span class="k">for</span><span class="w"> </span><span class="p">(</span><span class="k">auto</span><span class="w"> </span><span class="n">batch</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="o">*</span><span class="n">dataloader_</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w">      </span><span class="n">batched_data_</span><span class="p">.</span><span class="n">push_back</span><span class="p">(</span><span class="n">batch</span><span class="p">.</span><span class="n">data</span><span class="p">);</span>
<span class="w">    </span><span class="p">}</span>
<span class="w">    </span><span class="n">it_</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">batched_data_</span><span class="p">.</span><span class="n">begin</span><span class="p">();</span>
<span class="w">  </span><span class="p">}</span>

<span class="w">  </span><span class="kt">int</span><span class="w"> </span><span class="n">getBatchSize</span><span class="p">()</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="k">noexcept</span><span class="w"> </span><span class="k">override</span><span class="w"> </span><span class="p">{</span>
<span class="w">    </span><span class="c1">// HACK: Torch-TensorRT only uses explict batch sizing, INT8 Calibrator does not</span>
<span class="w">    </span><span class="c1">// work when reporting the batch size here and having explicity batching.</span>
<span class="w">    </span><span class="c1">// So we just report batch size 1 (warnings will still be printed out).</span>
<span class="w">    </span><span class="k">return</span><span class="w"> </span><span class="mi">1</span><span class="p">;</span>
<span class="w">    </span><span class="c1">// return static_cast&lt;int&gt;(dataloader_-&gt;options().batch_size);</span>
<span class="w">  </span><span class="p">}</span>

<span class="w">  </span><span class="kt">bool</span><span class="w"> </span><span class="n">getBatch</span><span class="p">(</span><span class="kt">void</span><span class="o">*</span><span class="w"> </span><span class="n">bindings</span><span class="p">[],</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="kt">char</span><span class="o">*</span><span class="w"> </span><span class="n">names</span><span class="p">[],</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">nbBindings</span><span class="p">)</span><span class="w"> </span><span class="k">noexcept</span><span class="w"> </span><span class="k">override</span><span class="w"> </span><span class="p">{</span>
<span class="w">    </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">it_</span><span class="w"> </span><span class="o">!=</span><span class="w"> </span><span class="n">batched_data_</span><span class="p">.</span><span class="n">end</span><span class="p">())</span><span class="w"> </span><span class="p">{</span>
<span class="w">      </span><span class="k">auto</span><span class="w"> </span><span class="n">status</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">get_batch_impl</span><span class="p">(</span><span class="n">bindings</span><span class="p">,</span><span class="w"> </span><span class="n">names</span><span class="p">,</span><span class="w"> </span><span class="n">nbBindings</span><span class="p">,</span><span class="w"> </span><span class="o">*</span><span class="n">it_</span><span class="p">);</span>
<span class="w">      </span><span class="n">it_</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="o">++</span><span class="n">it_</span><span class="p">;</span>
<span class="w">      </span><span class="k">return</span><span class="w"> </span><span class="n">status</span><span class="p">;</span>
<span class="w">    </span><span class="p">}</span><span class="w"> </span><span class="k">else</span><span class="w"> </span><span class="p">{</span>
<span class="w">      </span><span class="c1">// Reset iterator if incase calibrator is going to be used again</span>
<span class="w">      </span><span class="n">it_</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">batched_data_</span><span class="p">.</span><span class="n">begin</span><span class="p">();</span>
<span class="w">      </span><span class="k">return</span><span class="w"> </span><span class="nb">false</span><span class="p">;</span>
<span class="w">    </span><span class="p">}</span>
<span class="w">  </span><span class="p">}</span>

<span class="w">  </span><span class="k">const</span><span class="w"> </span><span class="kt">void</span><span class="o">*</span><span class="w"> </span><span class="n">readCalibrationCache</span><span class="p">(</span><span class="kt">size_t</span><span class="o">&amp;</span><span class="w"> </span><span class="n">length</span><span class="p">)</span><span class="w"> </span><span class="k">noexcept</span><span class="w"> </span><span class="k">override</span><span class="w"> </span><span class="p">{</span>
<span class="w">    </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">use_cache_</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w">      </span><span class="n">std</span><span class="o">::</span><span class="n">stringstream</span><span class="w"> </span><span class="n">ss</span><span class="p">;</span>
<span class="w">      </span><span class="n">ss</span><span class="w"> </span><span class="o">&lt;&lt;</span><span class="w"> </span><span class="s">&quot;Reading Calibration Cache from &quot;</span><span class="w"> </span><span class="o">&lt;&lt;</span><span class="w"> </span><span class="n">cache_file_path_</span><span class="p">;</span>
<span class="w">      </span><span class="n">logging</span><span class="o">::</span><span class="n">log</span><span class="p">(</span><span class="n">logging</span><span class="o">::</span><span class="n">Level</span><span class="o">::</span><span class="n">kINFO</span><span class="p">,</span><span class="w"> </span><span class="n">ss</span><span class="p">.</span><span class="n">str</span><span class="p">());</span>

<span class="w">      </span><span class="n">cache_</span><span class="p">.</span><span class="n">clear</span><span class="p">();</span>
<span class="w">      </span><span class="n">std</span><span class="o">::</span><span class="n">ifstream</span><span class="w"> </span><span class="nf">input</span><span class="p">(</span><span class="n">cache_file_path_</span><span class="p">,</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">ios</span><span class="o">::</span><span class="n">binary</span><span class="p">);</span>
<span class="w">      </span><span class="n">input</span><span class="w"> </span><span class="o">&gt;&gt;</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">noskipws</span><span class="p">;</span>
<span class="w">      </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">input</span><span class="p">.</span><span class="n">good</span><span class="p">())</span><span class="w"> </span><span class="p">{</span>
<span class="w">        </span><span class="n">std</span><span class="o">::</span><span class="n">copy</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n">istream_iterator</span><span class="o">&lt;</span><span class="kt">char</span><span class="o">&gt;</span><span class="p">(</span><span class="n">input</span><span class="p">),</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">istream_iterator</span><span class="o">&lt;</span><span class="kt">char</span><span class="o">&gt;</span><span class="p">(),</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">back_inserter</span><span class="p">(</span><span class="n">cache_</span><span class="p">));</span>
<span class="w">        </span><span class="n">logging</span><span class="o">::</span><span class="n">log</span><span class="p">(</span><span class="n">logging</span><span class="o">::</span><span class="n">Level</span><span class="o">::</span><span class="n">kDEBUG</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;Cache read&quot;</span><span class="p">);</span>
<span class="w">      </span><span class="p">}</span>
<span class="w">      </span><span class="n">length</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">cache_</span><span class="p">.</span><span class="n">size</span><span class="p">();</span>
<span class="w">      </span><span class="k">return</span><span class="w"> </span><span class="n">length</span><span class="w"> </span><span class="o">?</span><span class="w"> </span><span class="n">cache_</span><span class="p">.</span><span class="n">data</span><span class="p">()</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="k">nullptr</span><span class="p">;</span>
<span class="w">    </span><span class="p">}</span>
<span class="w">    </span><span class="k">return</span><span class="w"> </span><span class="k">nullptr</span><span class="p">;</span>
<span class="w">  </span><span class="p">}</span>

<span class="w">  </span><span class="kt">void</span><span class="w"> </span><span class="n">writeCalibrationCache</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="kt">void</span><span class="o">*</span><span class="w"> </span><span class="n">cache</span><span class="p">,</span><span class="w"> </span><span class="kt">size_t</span><span class="w"> </span><span class="n">length</span><span class="p">)</span><span class="w"> </span><span class="k">noexcept</span><span class="w"> </span><span class="k">override</span><span class="w"> </span><span class="p">{</span>
<span class="w">    </span><span class="n">std</span><span class="o">::</span><span class="n">ofstream</span><span class="w"> </span><span class="nf">cache_file</span><span class="p">(</span><span class="n">cache_file_path_</span><span class="p">,</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">ios</span><span class="o">::</span><span class="n">binary</span><span class="p">);</span>
<span class="w">    </span><span class="n">cache_file</span><span class="p">.</span><span class="n">write</span><span class="p">(</span><span class="k">reinterpret_cast</span><span class="o">&lt;</span><span class="k">const</span><span class="w"> </span><span class="kt">char</span><span class="o">*&gt;</span><span class="p">(</span><span class="n">cache</span><span class="p">),</span><span class="w"> </span><span class="n">length</span><span class="p">);</span>
<span class="w">    </span><span class="n">std</span><span class="o">::</span><span class="n">stringstream</span><span class="w"> </span><span class="n">ss</span><span class="p">;</span>
<span class="w">    </span><span class="n">ss</span><span class="w"> </span><span class="o">&lt;&lt;</span><span class="w"> </span><span class="s">&quot;Saved Calibration Cache to &quot;</span><span class="w"> </span><span class="o">&lt;&lt;</span><span class="w"> </span><span class="n">cache_file_path_</span><span class="p">;</span>
<span class="w">    </span><span class="n">logging</span><span class="o">::</span><span class="n">log</span><span class="p">(</span><span class="n">logging</span><span class="o">::</span><span class="n">Level</span><span class="o">::</span><span class="n">kINFO</span><span class="p">,</span><span class="w"> </span><span class="n">ss</span><span class="p">.</span><span class="n">str</span><span class="p">());</span>
<span class="w">  </span><span class="p">}</span>

<span class="w">  </span><span class="k">operator</span><span class="w"> </span><span class="n">nvinfer1</span><span class="o">::</span><span class="n">IInt8Calibrator</span><span class="o">*</span><span class="p">()</span><span class="w"> </span><span class="p">{</span>
<span class="w">    </span><span class="k">return</span><span class="w"> </span><span class="k">reinterpret_cast</span><span class="o">&lt;</span><span class="n">nvinfer1</span><span class="o">::</span><span class="n">IInt8Calibrator</span><span class="o">*&gt;</span><span class="p">(</span><span class="k">this</span><span class="p">);</span>
<span class="w">  </span><span class="p">}</span>

<span class="w"> </span><span class="k">private</span><span class="o">:</span>
<span class="w">  </span><span class="n">DataLoader</span><span class="o">*</span><span class="w"> </span><span class="n">dataloader_</span><span class="p">;</span>
<span class="w">  </span><span class="k">const</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">string</span><span class="o">&amp;</span><span class="w"> </span><span class="n">cache_file_path_</span><span class="p">;</span>
<span class="w">  </span><span class="kt">size_t</span><span class="w"> </span><span class="n">cache_size_</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
<span class="w">  </span><span class="kt">bool</span><span class="w"> </span><span class="n">use_cache_</span><span class="p">;</span>
<span class="w">  </span><span class="n">std</span><span class="o">::</span><span class="n">vector</span><span class="o">&lt;</span><span class="kt">char</span><span class="o">&gt;</span><span class="w"> </span><span class="n">cache_</span><span class="p">;</span>
<span class="w">  </span><span class="n">std</span><span class="o">::</span><span class="n">vector</span><span class="o">&lt;</span><span class="n">torch</span><span class="o">::</span><span class="n">Tensor</span><span class="o">&gt;</span><span class="w"> </span><span class="n">batched_data_</span><span class="p">;</span>
<span class="w">  </span><span class="n">std</span><span class="o">::</span><span class="n">vector</span><span class="o">&lt;</span><span class="n">torch</span><span class="o">::</span><span class="n">Tensor</span><span class="o">&gt;::</span><span class="n">iterator</span><span class="w"> </span><span class="n">it_</span><span class="p">;</span>
<span class="p">};</span>

<span class="k">template</span><span class="w"> </span><span class="o">&lt;</span><span class="k">typename</span><span class="w"> </span><span class="nc">Algorithm</span><span class="o">&gt;</span>
<span class="k">class</span><span class="w"> </span><span class="nc">Int8CacheCalibrator</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="n">Algorithm</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">public</span><span class="o">:</span>
<span class="w">  </span><span class="n">Int8CacheCalibrator</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">string</span><span class="o">&amp;</span><span class="w"> </span><span class="n">cache_file_path</span><span class="p">)</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="n">cache_file_path_</span><span class="p">(</span><span class="n">cache_file_path</span><span class="p">)</span><span class="w"> </span><span class="p">{}</span>

<span class="w">  </span><span class="kt">int</span><span class="w"> </span><span class="n">getBatchSize</span><span class="p">()</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="k">noexcept</span><span class="w"> </span><span class="k">override</span><span class="w"> </span><span class="p">{</span>
<span class="w">    </span><span class="c1">// HACK: Torch-TensorRT only uses explict batch sizing, INT8 Calibrator does not</span>
<span class="w">    </span><span class="c1">// work when reporting the batch size here and having explicity batching.</span>
<span class="w">    </span><span class="c1">// So we just report batch size 1 (warnings will still be printed out).</span>
<span class="w">    </span><span class="k">return</span><span class="w"> </span><span class="mi">1</span><span class="p">;</span>
<span class="w">  </span><span class="p">}</span>

<span class="w">  </span><span class="kt">bool</span><span class="w"> </span><span class="n">getBatch</span><span class="p">(</span><span class="kt">void</span><span class="o">*</span><span class="w"> </span><span class="n">bindings</span><span class="p">[],</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="kt">char</span><span class="o">*</span><span class="w"> </span><span class="n">names</span><span class="p">[],</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">nbBindings</span><span class="p">)</span><span class="w"> </span><span class="k">noexcept</span><span class="w"> </span><span class="k">override</span><span class="w"> </span><span class="p">{</span>
<span class="w">    </span><span class="k">return</span><span class="w"> </span><span class="nb">false</span><span class="p">;</span>
<span class="w">  </span><span class="p">}</span>

<span class="w">  </span><span class="k">const</span><span class="w"> </span><span class="kt">void</span><span class="o">*</span><span class="w"> </span><span class="n">readCalibrationCache</span><span class="p">(</span><span class="kt">size_t</span><span class="o">&amp;</span><span class="w"> </span><span class="n">length</span><span class="p">)</span><span class="w"> </span><span class="k">noexcept</span><span class="w"> </span><span class="k">override</span><span class="w"> </span><span class="p">{</span>
<span class="w">    </span><span class="n">std</span><span class="o">::</span><span class="n">stringstream</span><span class="w"> </span><span class="n">ss</span><span class="p">;</span>
<span class="w">    </span><span class="n">ss</span><span class="w"> </span><span class="o">&lt;&lt;</span><span class="w"> </span><span class="s">&quot;Reading Calibration Cache from &quot;</span><span class="w"> </span><span class="o">&lt;&lt;</span><span class="w"> </span><span class="n">cache_file_path_</span><span class="p">;</span>
<span class="w">    </span><span class="n">logging</span><span class="o">::</span><span class="n">log</span><span class="p">(</span><span class="n">logging</span><span class="o">::</span><span class="n">Level</span><span class="o">::</span><span class="n">kINFO</span><span class="p">,</span><span class="w"> </span><span class="n">ss</span><span class="p">.</span><span class="n">str</span><span class="p">());</span>

<span class="w">    </span><span class="n">cache_</span><span class="p">.</span><span class="n">clear</span><span class="p">();</span>
<span class="w">    </span><span class="n">std</span><span class="o">::</span><span class="n">ifstream</span><span class="w"> </span><span class="nf">input</span><span class="p">(</span><span class="n">cache_file_path_</span><span class="p">,</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">ios</span><span class="o">::</span><span class="n">binary</span><span class="p">);</span>
<span class="w">    </span><span class="n">input</span><span class="w"> </span><span class="o">&gt;&gt;</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">noskipws</span><span class="p">;</span>
<span class="w">    </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">input</span><span class="p">.</span><span class="n">good</span><span class="p">())</span><span class="w"> </span><span class="p">{</span>
<span class="w">      </span><span class="n">std</span><span class="o">::</span><span class="n">copy</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n">istream_iterator</span><span class="o">&lt;</span><span class="kt">char</span><span class="o">&gt;</span><span class="p">(</span><span class="n">input</span><span class="p">),</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">istream_iterator</span><span class="o">&lt;</span><span class="kt">char</span><span class="o">&gt;</span><span class="p">(),</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">back_inserter</span><span class="p">(</span><span class="n">cache_</span><span class="p">));</span>
<span class="w">      </span><span class="n">logging</span><span class="o">::</span><span class="n">log</span><span class="p">(</span><span class="n">logging</span><span class="o">::</span><span class="n">Level</span><span class="o">::</span><span class="n">kDEBUG</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;Cache read&quot;</span><span class="p">);</span>
<span class="w">    </span><span class="p">}</span>
<span class="w">    </span><span class="n">length</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">cache_</span><span class="p">.</span><span class="n">size</span><span class="p">();</span>
<span class="w">    </span><span class="k">return</span><span class="w"> </span><span class="n">length</span><span class="w"> </span><span class="o">?</span><span class="w"> </span><span class="n">cache_</span><span class="p">.</span><span class="n">data</span><span class="p">()</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="k">nullptr</span><span class="p">;</span>
<span class="w">  </span><span class="p">}</span>

<span class="w">  </span><span class="kt">void</span><span class="w"> </span><span class="n">writeCalibrationCache</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="kt">void</span><span class="o">*</span><span class="w"> </span><span class="n">cache</span><span class="p">,</span><span class="w"> </span><span class="kt">size_t</span><span class="w"> </span><span class="n">length</span><span class="p">)</span><span class="w"> </span><span class="k">noexcept</span><span class="w"> </span><span class="k">override</span><span class="w"> </span><span class="p">{</span>
<span class="w">    </span><span class="n">std</span><span class="o">::</span><span class="n">ofstream</span><span class="w"> </span><span class="nf">cache_file</span><span class="p">(</span><span class="n">cache_file_path_</span><span class="p">,</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">ios</span><span class="o">::</span><span class="n">binary</span><span class="p">);</span>
<span class="w">    </span><span class="n">cache_file</span><span class="p">.</span><span class="n">write</span><span class="p">(</span><span class="k">reinterpret_cast</span><span class="o">&lt;</span><span class="k">const</span><span class="w"> </span><span class="kt">char</span><span class="o">*&gt;</span><span class="p">(</span><span class="n">cache</span><span class="p">),</span><span class="w"> </span><span class="n">length</span><span class="p">);</span>
<span class="w">    </span><span class="n">std</span><span class="o">::</span><span class="n">stringstream</span><span class="w"> </span><span class="n">ss</span><span class="p">;</span>
<span class="w">    </span><span class="n">ss</span><span class="w"> </span><span class="o">&lt;&lt;</span><span class="w"> </span><span class="s">&quot;Saved Calibration Cache to &quot;</span><span class="w"> </span><span class="o">&lt;&lt;</span><span class="w"> </span><span class="n">cache_file_path_</span><span class="p">;</span>
<span class="w">    </span><span class="n">logging</span><span class="o">::</span><span class="n">log</span><span class="p">(</span><span class="n">logging</span><span class="o">::</span><span class="n">Level</span><span class="o">::</span><span class="n">kINFO</span><span class="p">,</span><span class="w"> </span><span class="n">ss</span><span class="p">.</span><span class="n">str</span><span class="p">());</span>
<span class="w">  </span><span class="p">}</span>

<span class="w">  </span><span class="k">operator</span><span class="w"> </span><span class="n">nvinfer1</span><span class="o">::</span><span class="n">IInt8Calibrator</span><span class="o">*</span><span class="p">()</span><span class="w"> </span><span class="p">{</span>
<span class="w">    </span><span class="k">return</span><span class="w"> </span><span class="k">reinterpret_cast</span><span class="o">&lt;</span><span class="n">nvinfer1</span><span class="o">::</span><span class="n">IInt8Calibrator</span><span class="o">*&gt;</span><span class="p">(</span><span class="k">this</span><span class="p">);</span>
<span class="w">  </span><span class="p">}</span>

<span class="w"> </span><span class="k">private</span><span class="o">:</span>
<span class="w">  </span><span class="k">const</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">string</span><span class="o">&amp;</span><span class="w"> </span><span class="n">cache_file_path_</span><span class="p">;</span>
<span class="w">  </span><span class="kt">size_t</span><span class="w"> </span><span class="n">cache_size_</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
<span class="w">  </span><span class="n">std</span><span class="o">::</span><span class="n">vector</span><span class="o">&lt;</span><span class="kt">char</span><span class="o">&gt;</span><span class="w"> </span><span class="n">cache_</span><span class="p">;</span>
<span class="p">};</span>

<span class="k">template</span><span class="w"> </span><span class="o">&lt;</span><span class="k">typename</span><span class="w"> </span><span class="nc">Algorithm</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">nvinfer1</span><span class="o">::</span><span class="n">IInt8EntropyCalibrator2</span><span class="p">,</span><span class="w"> </span><span class="k">typename</span><span class="w"> </span><span class="nc">DataLoader</span><span class="o">&gt;</span>
<span class="kr">inline</span><span class="w"> </span><span class="n">Int8Calibrator</span><span class="o">&lt;</span><span class="n">Algorithm</span><span class="p">,</span><span class="w"> </span><span class="n">DataLoader</span><span class="o">&gt;</span><span class="w"> </span><span class="n">make_int8_calibrator</span><span class="p">(</span>
<span class="w">    </span><span class="n">DataLoader</span><span class="w"> </span><span class="n">dataloader</span><span class="p">,</span>
<span class="w">    </span><span class="k">const</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">string</span><span class="o">&amp;</span><span class="w"> </span><span class="n">cache_file_path</span><span class="p">,</span>
<span class="w">    </span><span class="kt">bool</span><span class="w"> </span><span class="n">use_cache</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w">  </span><span class="k">return</span><span class="w"> </span><span class="n">Int8Calibrator</span><span class="o">&lt;</span><span class="n">Algorithm</span><span class="p">,</span><span class="w"> </span><span class="n">DataLoader</span><span class="o">&gt;</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n">move</span><span class="p">(</span><span class="n">dataloader</span><span class="p">),</span><span class="w"> </span><span class="n">cache_file_path</span><span class="p">,</span><span class="w"> </span><span class="n">use_cache</span><span class="p">);</span>
<span class="p">}</span>

<span class="k">template</span><span class="w"> </span><span class="o">&lt;</span><span class="k">typename</span><span class="w"> </span><span class="nc">Algorithm</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">nvinfer1</span><span class="o">::</span><span class="n">IInt8EntropyCalibrator2</span><span class="o">&gt;</span>
<span class="kr">inline</span><span class="w"> </span><span class="n">Int8CacheCalibrator</span><span class="o">&lt;</span><span class="n">Algorithm</span><span class="o">&gt;</span><span class="w"> </span><span class="n">make_int8_cache_calibrator</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">string</span><span class="o">&amp;</span><span class="w"> </span><span class="n">cache_file_path</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w">  </span><span class="k">return</span><span class="w"> </span><span class="n">Int8CacheCalibrator</span><span class="o">&lt;</span><span class="n">Algorithm</span><span class="o">&gt;</span><span class="p">(</span><span class="n">cache_file_path</span><span class="p">);</span>
<span class="p">}</span>

<span class="p">}</span><span class="w"> </span><span class="c1">// namespace ptq</span>
<span class="p">}</span><span class="w"> </span><span class="c1">// namespace torch_tensorrt</span>
</pre></div>
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